Port the renderer from Glium to WGPU #153
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Before upgrading, I got the following error when running rust-doom on Ubuntu 23.10:
```
[INFO engine::context] Creating system "tick"... │
[INFO engine::context] Creating system "frame_timers"... │
[INFO engine::context] Creating system "window"... │
interface 'wl_output' has no event 4 │
thread 'main' panicked at /home/hovinen/.cargo/registry/src/index.crates.io-6f17d22bba15001f/winit-0.21.0/src/platform_impl/linux/wayland/event_loop.rs:395:10: │
called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" } │
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace │
```
This attempts to do just the minimum needed to bring winit and glium up to their latest versions. This requires several changes due to API changes in those libraries. Other than that, I am avoiding any rearchitecting or other changes.
After upgrading, the program runs without crashing. One can navigate the levels, but the graphics and animation are a messed up. I don't know the code well enough to be able to fix that problem easily.
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Not sure whether you would ever want to merge this, but I thought I'd try porting this renderer to WGPU, just for fun. Consider this PR a "heads up".
All the functionality from the Glium version works as far as I can tell. Figuring out how to map the existing structure to WGPU idioms was a bit challenging. I make no guarantees about whether the code in its current from is still idiomatic :-)